The skull found on the first card, does it have a special purpose or is it just to unlock something. In the third card, the lift does not work. I managed to get down by throwing myself in but bots they can not.
Card 4 is impossible to play. At first, first wave of zombies, 2 minutes after the second wave of zombies is huge, there are so many zombies that the game crash...
Amazing and big campain